21772045 has 8 divisors (see below), whose sum is σ = 26682624. Its totient is φ = 17046864.

The previous prime is 21772033. The next prime is 21772057. The reversal of 21772045 is 54027712.

It is an interprime number because it is at equal distance from previous prime (21772033) and next prime (21772057).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21772045 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46089 + ... + 46558.

It is an arithmetic number, because the mean of its divisors is an integer number (3335328).

Almost surely, 2^21772045 is an apocalyptic number.

It is an amenable number.

21772045 is a deficient number, since it is larger than the sum of its proper divisors (4910579).

21772045 is an equidigital number, since it uses as much as digits as its factorization.

21772045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92699.

The product of its (nonzero) digits is 3920, while the sum is 28.

The square root of 21772045 is about 4666.0524000487. The cubic root of 21772045 is about 279.2327849135.

Adding to 21772045 its reverse (54027712), we get a palindrome (75799757).

The spelling of 21772045 in words is "twenty-one million, seven hundred seventy-two thousand, forty-five".